Telephone-transmitter.



'2 SHEETS-SHEET 1.

No. 819,522. PATENTED MAY 1, 1906. E. R. GORWIN & F. R. PARKER. "TELEPHONE TRANSMITTER.

APPLIOATION FILED MAY 6, 1903.

INVENTORS.

WITNESSES;

PATENTED MAY 1, 1906, E R. .GORWIN & F. R. PARKER. TELEPHONE TRANSMITTER.

APPLICATION FILED MAY6, 1903.

2 SHEETSSHEET 2.

J 751F167; vii/$11,311: :1; 1,3351% l vlll u .llfllllfflfllil'lllfll Iii MEN ram (2M Zw M%%..

WITNESSES.

ITED STATES PATENT OFFICE.

EL'MER ncoRwIN, or WEST'LAFAYETTE, AND FREDERICK a; BARKER,

or LA FAYETTE, INDIANA; SAID 'conwnv ssrenoa TO SAID PARKER.

TELEPHONE-TRANSMITTER.

Specification of Letters Patent.

Patented May 1, 1906.

Application filed May 6, 1903. Serial No. 155,871-

To all whom it may concern:

' Be it known that we, ELMER R. Conwm, residing at West Lafayette, and FREDERICK R. PARKER,'1eSldlI1g atLa Fayette, in the county, of Tippecanoe and State of Indiana,

citizens of the United States, have invented new and useful 'Im'pirovements in Telephone-- the speaking-diaphragm and frame of the transmitter being entirely insulated from the saidelectric currents; second, to provide'a speaking-die hragmwhich is entirely free fromallmec anical arrangements connecting it permanently to the working parts of the transmitter, but which merely touches a point at its center when the transmitter is in adjustment; third, to provide a secondary diaphragm which constitutes one-of the said electrodes andwhich is "entirely inclosed and insulated from the speakingdiaphragm; fourth, to provide an improved form of cup forcarrying the ranular carbon orequivalent material and. the two electrodes, and, fifth, to provide an improved form of dampener-springs for the s eaking-diaphragm which are capable'of adiilstment. i

In our present invention we have shown a' telephone-transmitterin which the anular carbon and two electrodes are carried by) a non-conducting cup, the back electrode ing fastenedpermanently to the said 1 cup, while thefront electrode, which isthe secondary diaphragm, is, held in placeby a ring screwed a)" the saifd cup. 'A'sr'nall projecting in is carried by an insulatlng disk, which is eld to the secondary" diaphragm by the said ringand touches against the speakin -diaphragmiwhe'nthe transmitter is in a just-- ment. Thespeaking-diaphragm is held. in place by two spiral dampener-springs, which arev adjusted'against the speaking-diaphragm to give the deslred tonein the transmitter.

We have'illustrated our invention in the accompanying drawings, in which annular recess in which is Figure I is a vertical sectional view taken through the axis of the transmitter, portions of the structure being shown in elevation. Fig. 2 is a rear view of-the transmitter, the inclosing shell being removed to show detailsof construction. Fig. 3 is an enlarged view of elements shown inFig. 1 in separated rela tion. Fig. 4 is'an enlarged view of a portion of Fig. 1. Fig. Sis a view shhwing the secondary diaphragm. with projectin pin attached thereto. 6 is a view s owing a stationary Epost with projecting pin attached thereto. ig. 7 isan enlarged sectional view of a portion of a modified form of transmitter, taken throu h the axis thereof with portions shown in e evation and showing the electrOde-carrying cup attached to the back side of the speaking-d1aphragm.; Fig. 8 is an enlarged sectional view of a portion of another modified form of transmitter, taken the same as Fig. 7 and showing the electrode-carrying cup attached to the front side of the s eaking-diaphragm. Fig. 9 is an enlarge sectional view of the s eakingdiaphragm, taken through its axis, s attached thereto.

Like characters refer to like parts in the different figures.

- In our present invention we. have employed the general arrangement frequently ound in other transmitters, there being provided the usual mouth iece 'y, secured to the front plate zby threa ed engagement therewith, .a shell 0 being fastened to'the plate 2 by the vscrews I), thus inclosing the transmitter parts. The front plate 2 is provided with an placed a folded soft-rubber. ring a, the spea ing-diaphragm as shown. The usual bridge ais sebridge being U-shaped at its middle, so as to owingthe p'rojecting pin 10 being contained between the folds of the ring a,

cured to the front plate 2 by the screws a, the

provide a space for the electrode-carrying referably hard rubber, and is secured to the hack electrode 0 by threaded engagement therewith, as shown in Fig. d. Although we cu e. n a a .n I lhe cupe is made of insulating material, 4

preferabl securethe electrode-carrying cup e to the rid e a through the agencyof the back electro e o, as shown n F 1, we desire it to be understood that the em on may be secured to theback side of the spea ing difilphragm, as shown in Fig. 7, or to the front speakingiaphragm 12 takes the place of the ring t. The disk 8 is preferabl mica, but maybe of any insulating materia it is to be understood that electro es of other material may be used instead. Conductor g is soldered to the front electrode r. The projecting pin w is cemented'to the mica disk 8,

as shown in Fig. 3. If the said projecting pin is made of'insulating material, the said mica disk may be dispensed with entirely, in which case the said projecting pin will be secured to the secondary diaphragm, as shown in Fig. 5. It will also be understood that a conducting projecting pin ma be secured direct to the secondary diap agm, as the speaking-diaphragm is insulated from the frame of the transmitter. In the arrangements shown in Figs. 7 and 8 it is to be understood that the projecting pin w may be 'secured to a rigid post (1, as shown in Fig. 6, the

0st d being in turn secured to the bridge or rame of the transmitter. It is also to be understood that the said projecting in 'w may be secured to the speaking-diap agm, as shown in Fig. 9, instead of being secured to the disk .9, as shown in Fig. 3, or to the sec- 'ondary diaphragm, as shown in Fig. 5. The insulating-bushing b is screwed through the bridge a, and the metal bushing c is in turn screwed through the bushing b, as shown in Fig. 1. The back electrode 0 extends through the bushing 11 and is secured thereto by the set-screw d. Thus it will be seen that bythe set-screw d the in to may be adjusted against the speakingiaphragm v with any desired pressure. The hollow screw it is secured to the bridge a by threaded engagement therewith and is locked by the nut a. One end of a coil-spring g is inserted into the hollow of screw h, while theother end'of spring 9 carries a pin f, with a felt covering g. The pin f is preferably made of soft rubber with a felt covering 9 next to the s eaking-di'aphragm; but any other'materia may be used. The covering g of pin f therefore rests on the speaking-diaphragm 'v and ma be given any pressure desired against t e speaking-diaphragm by adjusting the screw it, and thereby dampen the s eaking-diaphragm so as to give the desire tone in the transmitter. The hollow ca j is also secured to the bridge a by threaded engagement therewith and, like screw h, contains Theelec trodes 0 and r are preferably goldlated; but

one end of a coil-spring g. This coil-spring also carries a pin f, with a covering g, which rest against the rubber ring a.

The binding-post 7c is secured to the bridge a by the screw n, and the clip Z is secured to the binding-post k by the screw m. The binding-post 7c is made of. hard rubber, and the screws m and n do not meet, thus insulating the clip Z from the bridge a. The secondary diaphragm 1' is electrically connected to the clip Z by the conductor g, which passes through a hole in the cu ,e, as shown. The conductors leading to t e transmitter will therefore be fastened, respectively, to screws m and p.

When the speaking-diaphragm v is vibrated', the vibrations are transmitted to the pin w, mica disk 3, and secondar diaphragm r, due to the pressure between t e inw and the speaking-dia hragm '0. The c amber in the cup e'is ma' e large in diameter next to the secondary diaphragm 1', so as to give the secondary diaphragm r a larger vibrating surface 'to act on the granular carbon or equivalent material, and smaller in diameter next to the back electrode 0, so as not to I6' quire such a large battery-currentfor operating the transmitter successfully. The space between the front and back electrodes is filled loosely with granular carbon or equivalent material, so as not to pack from expan- S1011.

The secondary diaphragm r, vibrating against the granular carbon w, changes the pressure on the said carbon, and therefore changes its resistance, thus producing the talking-currents in the usual manner, provided the transmitter isfurnished with the necessary electric current. rents traverse the back electrode 0, granular carbon or equivalent material in, secondary diaphragm or front electrode 1', conductor q,

and clip Z, the remainder ofthe transmitter,

except the ring t and screws m and p, being insu ated therefrom.

In case the arrangement shown in Fig. 5 is used, where the pro'ecting pin is a conductor, the speaking-diap agm is not insulatedfrom the secondary diaphragm or front electrode.

In Fig. 7 the speaking-diaphragm 'v is cut out, so as to allow the back electrode a to pass through itwithout making contacttherewith. The speaking-diaphragm is also cut out to accommodate the conductor g.

The cup e is-secured to the speaking-diaphragm v by the screws f. In this arrangement the granular carbon or equivalent material is acted upon by the projecting pin pressing against t e rigid (post (1 as the speak- 1ng-d1a hragm is vibrate l 11' 1g. 8 the sgleaking-diaphragm is cut out so as to allow t e disk 8 to. present an exposed surfacei The cup e iss'ecu'red to the speaking diaphragm v by the screws e, rub- The talking-curher bushings h being used to; insulate the said screws from the speaking+diaphragm 'In this arrangement the granularcarbon'is acted upon in a 'mannersimilartofth'atde-' scribed for Fig. .1". i

While we have' herein shownand articularly described preferred-t es o .our invention, we

the precise-l construction and arra em nt.

phragm', and a coi -s ary diaphragm,

herein shown.

H Having thusdescribedour nvention, whatwe clair'nas newrend desirejfm secure by Letters Patent, is 1. In-a transnntter:

the p k g ian jecting pin m akin contact.therem'th,'fln in, sulati-ng disk to described.

2. In "a telephone--transmitter, a die- Ph em, diaphragm, a dam against the secondary diapnragm 'and'eover i'ng same, andajpininterpo'sedbetween the speak ng. diaphragm-and the insulating-disk,

for the purpose of transmitting the vibrations of the" speaking-diaphragmto thes'econdary diaphragm, substantially :as described.

4. In'a'transnntter, the combination with the electrode-containing cup thereof, of a back electrode contained therein, a threaded ring screwed'to the said 'cup,,a front/electrode held to the cup by thesaid ring, an insulating-disk held to the-front electrode by the said ring, and a projecting in secured to the insulating-disk, substantial ly as described.

5. In a transmitter, the combinationwith the electrode-carrying cup thereof, of an 'elec'-. trode contained in the said cup, a threaded ring secured to the said cup, a secondary diaphragz. 1 usedfas theother electrode; and. se-

cured to the said cup by the said ring, an in sulatin'g-disk held to: the secondary diaphragm by the said ring,- and a projecting pin secured to the said dislr,substantially as described.

" her in the s'aid cu 6. Ina transmitter, the-combination with the electrode-carrying cup thereof, of an electroderigidly cntained in the said cup, a ring. secured to the said cup by threaded engagementthei'ewith, a secondary diaphragm used as the other electrodeand secured to the said cup by the said ring, a conical-shaped chamtrodes, the larger" iameter ofwhich is next to the secondary diaphragm, the said chamher being used to contain the granular cars boh' or Iequiva1entmaterial, an insulatingdonot' wvlish' to lim'i ourselves to the" combination-with magm ther bfir a P ieh the projecting pin is secured, 'and a secondary diaphragm resting a ainst the insulating disk, substantially as the combination with the speaking-diaphragm thereof, of a seconda flexible insulating-disk held between the said else between the said gold-plated electrodes, the larger diameter of which-is next to the said secondary diaphragm, the saidchamber being used to contain the granular carbon or equivalent material, a1mica disk held to the said secondary diaphragm and a projecting pin secured to the mica disk, substantially'as described: i f "8'. In a transmitter, the combination with the electrode-carrying cup'thereoi, of a goldcured to the said cup 'by threaded -"engagement' therewith, a ring securedto the said on by threaded engagement therewith, a 4 'go d-"plated'secondary dia hragmuse'd as the front electrode and secure .thesaid ring,

the said cup electrodes, the larger diameter of which isv next'to the disk held to the said secondary diaphragm .by the said ring and a projecting pin secured to the mica dis substantiallyas described.

ary diaphragm used as an electrode, an lating-disk held to the secondary diaphragm, a projecting pin secured to the said disk and interposed between .the speaking diaphragm,

transmitter is in ad ust'ment,-an electrodecarryingcup made of insulating material and tonwhic'h the held,'an e ectrode contained in the said cup and'securedtnereto, I projecting pin may be] adjusted "a ainst. the

scribed. i r v 1'0 'In a transmitter, the 'combinati on with the speaking-diaphragm thereof, of a second .ary diaphra m used as one electrode, an insulating disk eld vagainst the secondary diaphragm, a, projecting in' making contact with the insulating-dis and thef speakingdiaphragm when the transmitter is in adjustment, an electrode-carrying cup to which the secondary diaphragm is. held, a conductor soldered to the secondaryedia hragm and extending through a hole ini't e said cup, an electrode secured to and contained in the said cup, and means whereby the insulating-disk diaphragm-used as the other elecsecondary diaphragm is;

disk held to the said secondary diaphragm ycontained in the said by the said'ring,

plated back electrodeeontained in and setothe said cup by "aconica'l-shap'ed chamber in L between the ,said gold-plated ,saidsecondary diaphragm, the said chamber bemg used to contain the gran-. 'ular carbon-oi equivalent-material, Bun-RG8;

9'. In a transmitter, the com'binationwithr the speaking-diaphragm thereof, of a secondthe projecting i a u g the p k ngrdiaphragm when the and means whereby the speaking-"diaphragm, substantial y as demay be adjusted relatively to the speakingdiaphragm, substantially as described.

11. In a telephone-transmitter, a button comprising a receptacle for'retaining comminuted material, comminuted material in the receptacle, a flexible electrode covering the comminuted material and secured at its periphery to the button, and an insulating material applied to one surface of the said electrode and covering same.

12. In a transmitter, the combination of a speaking diaphragm, a granulecontaining means, a flexible secondary diaphragm se-- cured at its periphery to the granule-containing means and used as an electrode, a flexible insulating-disk covering the secondary diaphragm, and means for transmitting the vibrations of the speaking-diaphragm to the secondary diaphragm.

13. In a transmitter, the combination with the. granule-containing cup thereof, of an electrode contained in the said cup and secured thereto by threaded engagement therewith, a flexible diaphragm used as the other electrode, an insulating-disk, a ring adapted to secure the said diaphragm andsaid disk to the said cup, by threaded en agement therewith, means for connecting t e electrodes in the circuit, and means for vibrating the diaphragm.

14. In a telephonetransmitter, a button 1 comprising a-receptaclefor retaining comminuted material, comminuted material in the receptacle, a'fiexible'electrode covering the comminuted material and secured at its periphery to the button,fan insulating covermg for the exposed surface of the said electrode, and a secon. electrode supporting th button.

15. In a transmitter, the combination with the speaking-diaphragm thereof, of a rojecting pin'which rests against the speakingdiaphragm when the transmitter is in adjustment, a mica disk to which the'projecting are secured b pin is secured, a gold-plated secondary diaphragm used as an electrode, an insulating electrode-carrying cup .to which the mica disk and gold-plated secondary diaphragm the secondary diaphragm, means for adjusting the projecting pin against the speakingdiaphragm, and means whereby electrical conductors may be attached to the respec-' tive electrodes, substantially as described.

16.. Ina transmitter, the combination with the speaking-diaphragm thereof, of an eleca ring having threa:.ed en-- secured to the said disk, and interposed between the latter and the speaking-diaphragm substantially as described.

17. In a transmitter, the combination with the speaking-diaphragm thereof, of an electrode-carrying cup, an electrode contained in and secured to the said cup, a secondary diaphragm used as an electrode and held to the said cup, a flexible insulating-disk held against the-secondary diaphragm, thus inclosing the latter and a pin interposed between the insulating-disk and the speakingdiaphragm, substantially as described.

18. In a transmitter, the combination with the speaking-diaphragm thereof, of an electrode-carrying cu' an electrode contained in and secured to t c said cup, a flexible secondary diaphra m used as an electrode andheld to the sai cup, a pin inter osed between the said diaphragms, a fiexib e sheet of insulation between the said pin and secondary'dia hra In and coverin the latter, and

means or a justing the sai in to enable it to transmit the vibrations of the speakingdiaphragm to the secondary diaphragm.

19.. In a transmitter, the combination With the speaking-diaphragm thereof, of an insulating, electrode-carrying cup, a gold-plated electrode contained in and secured to the said cup and insulated fromthe speaking-dia phragm, a gold-plated, flexible, secondary iaphragm used as an electrode and secured to the said cup, a mica disk held to the secondary diaphragm, a conical-shaped chamberin the said cup between the said electrodes, and used for containing the granular carbon or equivalent material, a projecting pin secured to the mica disk, means whereby the said pin may be adjusted so asto enable it to transmit vibrations from the speakingdiaphragm to the secondary diaphragm, and means whereby the said electrodes maybe f electrically connected to respective conductors leadingfrom the transmitter, substantially as described.

20. In a transmitter, the combination W1th the speaking-diaphragm thereof, of a granrile-containing means, a flexible electrode in the form of a diaphragm and secured at its periphery to the granule-containing means, a sheet of insulating material completely covering the said electrode, and means for transmittmg vibrations between the speaking-dim phragm and the said electrode.

21. In a transmitter, the combination with the speakingdia hragm thereof, of a damener-button hel thereto, a coil-spring for olding the dampener-button against the speaking-diaphragm, a socket for holding the coil-spring,-and a screw-adjustment to the ITO said socket whereby the'said button may be diaphragm used as an electrode. and secured 65 adjusted against the s eaking-diaphragm at its periphery to the ranule--contain1l 1g through the agency of t e coil-spring, submeans, means interposed between the said stantiall'yas described. s diaphragms and arranged totransmit the 5 22. Ina transmitter, the combination with vibrations of oneto the other, and an insuthe speaking-diaphragm thereof, of an annulating material covering the secondary dla- 7 lar, rubber fold which the edge of the phragm. p speakin diaphragm is inserted, a dam ener- 27. In a transmitter, thecombination of a button eld a ainst the said rubber old, a speaking-diaphragm, an electrode-carrying 'Io" coil-spring for olding the dampener-button cup, a flexible electrode secured at its-periphagainst therubber fold, and a socket secured cry to the electrode-carrying cup and; co v 75 to the bridge'of the transmitter and ada ted eredby an insulating material, and a pm 1nto hold the coil-spring in place, substantially terposed between the said diaphragm and as described. electrode and adapted to transmit the vibra- I 5 23. In a transmitter, the combination with tion of one to the other.

the speaking-diaphragm. thereof, of a dam- 28. In a transmitter, the combination with 80 -pener-buttonheld against the speaking-dia-i the granule-containing cup thereof, of an phragm, the said dampener-button being electrode contained therein, a ring secured to covered with a felt covering next to the the said cup, a flexible diaphragm used as the s eakin -dia' hra m, a coil-s rin which other electrode and-secured to the said cup v P g P g P g holds the dampener-button against the by the said'ring, an insnlating-diskcovering 5- speaking-diaphra m, a hollow screwsecured the said diaphragm-and held thereto by the to the bridge of the transmitter b threaded said ring, and means for vibrating the diaengagement therewith and which contains phragm.

one end of the'coil-spring, a lock-nut which 29. In a device of the character described,

locks the hollow screw to the bridge, and a granule-containing means, a speaking-dia- 9 means whereby the hollow screw may be adphragm, a flexible, conducting, secondary diajuste'd to adjust the coil-spring which in turn phragm secured at its periphery to the granadjusts the pressureof the-dampener-button ,ule containing means, insulating material o against the'speaking-diaphfragm, substancovering one'surface of the secondarydiatially as described. I phrag'm, and rmeans for transmitting vibra- 95 24. In a transmitter, the combination ofa I tions from one diaphragm to the other.

speaking-diaphragm, a bridge, .a dampener- In a telephone-transmitter, a diabutton'which rests against the speaking-dim a bridge extending over the dia.

phragm, a coil-spring adapted to h'old the phragm, a dampener button for the diadampener-button to the speaking-diaphragm Ehragm, and a coll-spring supported by the 100.

' a ollow screw in which one end of the coil ridge and capable of adjustment to adjust spring is inserted, the said hollow screw being i the dampener-button. secured'to the said bridge by threaded'em 35L. In a transmitter, a

granule-containing o, gagement therewith, a lock-nut by which the means, an electrode formed out of a flexible .hollow screw mag be locked to the bridge sheet of metaland a flexible sheet 'of insulatm5 means whereby t justed to adjust the said dampener-button at its peri hery to the granule-containing against the speaking-diaphragm, an annular means, an means for Vibratingthe electrode,

rubber fold in which the edge of the speaksubstantially as described. V ing-diaphragm is inserted, a second dam- 32. In a'transmitter, the combination with I pener-button which rests against the said the, granule-containing cup thereof, of an rubber fold, a secondcoil-spring adapted to 'el ntrodecontainedinthesaid cup andsecured holdthe said second dampener-button against thereto by threaded engagement'therewith,

the saidrubber fold, and a hollow nut in ,a flexiblediaphra '111 used as the other elecwhich one end of the said second coil-spring 'trode and secure to the said cup at its pe- 115 is inserted and which is securedto the said riphery,aflexible insulating-disk held against bridge, substantially as described. the sald diaphragm and covering same, and

25-. In a device-of the character described, means for vibrating the latter.

.5 a granule-containing means, flexible dia- 33. In a vtransmitter of the character de phragms, one being an electrode and secured scribed, a speakingdiaphragmnn electrode- I 20 at its periphery to the granule-contaming carrying means, a flexible electrode secured means, insulating materialcoyeringone surat its periphery to the electrode-carrying face of the said electrode, and means for means and covered byaninsulating material,

transmittingv'ibratior-s from one diaphragm. and means for transmitting Vibrations from to another. the diaphragm tothe electrode. I 5

26. Ina transmitter, the combination with- 34. Ina transmitter 0' the character dethe spea 'ng-diaphragm thereof, of a gran-- scribed, the combination-{wit tnegranuleule-containing means, a flexible secondary containing means thereof, of a ring, a flexible e hollow screw may be admg'material secured together, and secured electrode secured to the said means by the said ring, and insulating material covering one surface of the electrode.

v and the electrode.

36. In a device of the character described, granule-containing means, an electrode comprising a flexible piece of metal covered on' one side by insulating material and secured at its periphery to the granule-containing 'trode.

e electrode in the form of a diaphragmand means for trans- Biases means, and' means for vibrating the elec- 37. In a device of the character described,

the combination with the granule-containing means thereof, of a metallic electrode removably held at its periphery t'o'the said means,

and insulating material covering the electrode.- I

In witness whereof we hereunto subscribe our names this 2d day of May, A. D. 1903;

ELMER R.-CORWIN. FREDERICK-B. PARKER.-

Witnesses ARTHUR LEE, J. B. .MARAOK. 

